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Effects of Mg Addition with Natural Aging Time on Two-Step Aging Behavior in Al–Mg–Si Alloys
Influence of Mg contents with the natural aging (NA) time on the two-step aging behavior in Al–Mg–Si alloys is studied. Hardness is gradually increased during NA in the 3M4S, whereas dramatic increase of hardness after NA for 3.6 ks is confirmed in the 9M4S. Similar peak
hardness is confirmed between the two-step aged and single aged samples in the 3M4S. It means that there is no negative effect of two-step aging. On the other hand, the peak hardness is decreased for the naturally-aged sample compared with the single aged one in the 9M4S. Formation of Cluster
(1) is accelerated by the Mg addition, resulting in the negative effect of two-step aging. Meanwhile, the formation of the precipitates is accelerated by Mg addition during aging at 170 °C. The precipitate formed at the peak hardness during aging at 170 °C after natural aging for 43.2
ks is identified as the β″ phase based on the high resolution transmission electron microscope observation.
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Keywords: Al–Mg–Si Alloys; Mg Addition; Natural Aging; Precipitate; Two-Step Aging
Document Type: Research Article
Affiliations: Carbon and Light Materials Application Group, Korea Institute of Industrial Technology, Jeonju-si, Jeollabuk-do, 54853, South Korea
Publication date: 01 March 2018
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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